Amazon Basics AAAA 1.5 Volt Everyday Alkaline Batteries - Pack of 4 (Appearance may vary): Amazon.co.uk: Electronics & Photo
Duracell SpecialtyAlkaline AAAA Battery 1.5 V, Pack of 2 (LR8D425) Designed for Use in Digital Pens, Medical Devices and Headlamps: Amazon.co.uk: Electronics & Photo